2004 Infiniti Q45FACTORY OEM SERVICE PROCEDURE

DTC Confirmation Procedure

NOTE:
  • If DTC P1442 is displayed with P1448, perform trouble diagnosis for DTC P1448 first. (See DTC P1448 EVAP CANISTER VENT CONTROL VALVE  .)
  • If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION: 

  • Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 and 3/4 full and vehicle is placed on flat level surface. 
  • Always perform test at a temperature of 0 to 30°C (32 to 86°F). 

With CONSULT-II 

  1. Turn ignition switch ON.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
  4. Make sure that the following conditions are met.

    COOLAN TEMP/S: 0 - 70°C (32 - 158°F) 

    INT/A TEMP SE: 0 - 30°C (32 - 86°F) 

  5. Select "EVAP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-II. Follow the instruction displayed.
    Fig 1: View Of CONSULT-II Screens
    G00761110Courtesy of NISSAN MOTOR CO., U.S.A.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.